/Engine/Source/Runtime/SlateCore/Public/Rendering/SlateLayoutTransform.h
This works by transforming the origin through LHS then RHS. In matrix form, looks like this: [ Sa 0 0 ] [ Sb 0 0 ] [ 0 Sa 0 ] * [ 0 Sb 0 ] [ Tax Tay 1 ] [ Tbx Tby 1 ]
[FSlateLayoutTransform](API\Runtime\SlateCore\Rendering\FSlateLayoutTransform) Concatenate ( const [FSlateLayoutTransform](API\Runtime\SlateCore\Rendering\FSlateLayoutTransform) & RHS ) const